The invention provides a photo-thyristor valve for a fast change-over switch. The photo-thyristor valve for the fast change-over switch comprises a valve body frame assembly, a forward direction assembly, a reverse direction assembly, a dynamic voltage-sharing assembly, a static voltage-sharing assembly and a valve body supporting assembly. The forward direction assembly and the reverse direction assembly are arranged inside the valve body frame assembly in a longitudinal abreast mode, the dynamic voltage-sharing assembly and static voltage-sharing assembly are both fixed on the reverse direction assembly, the dynamic voltage-sharing assembly is fixed on the forward direction assembly at the same time, and the valve body supporting assembly is located on the bottom of the valve body frame assembly. The photo-thyristor valve for the fast change-over switch is compact in structure and reasonable in overall arrangement, the transverse and longitudinal arrangement of dynamic capacitors and resistors meets the requirements of electrical connection and insulation and also saves arrangement space, and a whole super power vertical type photo-thyristor valve is made to be compact and identical in structure.